DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Replace the front
catalytic con-
Step
1
CHECK ANY OTHER DTC ON DISPLAY.
2
CHECK EXHAUST SYSTEM.
Check for gas leaks or air suction caused by
loose or dislocated nuts and bolts, and open
hole at exhaust pipes.
NOTE:
Check the following positions.
*Between cylinder head and front exhaust pipe
*Between front exhaust pipe and front catalytic
converter
*Between front catalytic converter and rear cat-
alytic converter
Separate rear catalytic converter from rear
3
CHECK REAR CATALYTIC CONVERTER.
Contact with
SOA
(distributor) ser-
4
CHECK FRONT CATALYTIC CONVERTER.
Remove the front catalytic converter.
verter. <Ref. to
EC(D0HC
TURBO)-3, Front
Catalytic Con-
ve rter.
z
Check
)oes the Subaru Select Moni-
ir
or OBD-ll general scan tool
idicate DTC P0031, P0032,
'0131, P0132, P0133, P1130,
'1
131, P1134, P1139, P0037,
'0038, PO1 36 and PO1 39?
vice.
NOTE:
Inspection by DTL
is required, be
cause probabl,
cause is deteriora
tion
of
multipl'
parts.
s
there a fault in exhaust sys-
em?
s
there damage at rear face of
ear catalyst?
s
there damage at rear face
or
ront face of front catalyst?
Yes
nspect the rele-
rant DTC using
List of Diagnostic
rrouble Code
DTC)". <Ref. to
EN(D0HC
rURBO)-80, List
If
Diagnostic Trou-
)le Code (DTC).>
\IOTE:
n this case, it is
lot necessary to
nspect DTC
'0420.
3epair or replace
he exhaust sys-
em. <Ref. to
IX(D0HC
rURBO)-2, Gen-
?ral Description.>
3eplace the front
:atalytic converter
<Ref. to EC(D0HC
TURBO)-3, Front
Satalytic Con-
terter.> and rear
:atalytic converter
<Ref. to EC(D0HC
TURBO)-4, Rear
Catalytic Con-
werter.>
No
20
to step
2.
;o
to step
3.
;o
to step
4.
EN(D0HC TURBO)-197
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